Brillouin Zone Folding-Driven Topological Band Flips Based on BICs via Twisted Photonic Crystals.

Guanhua Yang, Tian Sang, Leyi Zhu, Chenyang Wang, Yueke Wang

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Article in Nanophotonics (Berlin, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 authors.

Guanhua YangDepartment of Optoelectronic Information Science and Engineering School of Optoelectronic Information and Physical Science Jiangnan University Wuxi China.

Tian SangDepartment of Optoelectronic Information Science and Engineering School of Optoelectronic Information and Physical Science Jiangnan University Wuxi China.ORCID https://orcid.org/0000-0002-9847-6001

Leyi ZhuDepartment of Optoelectronic Information Science and Engineering School of Optoelectronic Information and Physical Science Jiangnan University Wuxi China.

Chenyang WangDepartment of Optoelectronic Information Science and Engineering School of Optoelectronic Information and Physical Science Jiangnan University Wuxi China.

Yueke WangDepartment of Optoelectronic Information Science and Engineering School of Optoelectronic Information and Physical Science Jiangnan University Wuxi China.ORCID https://orcid.org/0000-0003-0304-5047

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6 · The paper itself

Abstract

Brillouin zone folding (BZF) associated with bound states in the continuum (BICs) has provided promising opportunities for light wave manipulation. Despite its significance, achieving and understanding BZF-induced band flips based on BICs in momentum space remain unresolved. Here, we demonstrate that such BZF-driven topological band flips can be realized by using twisted photonic crystals (PhCs) based on BICs. The twist perturbation folds all high-symmetry points of the bands to the Γ point, and each band generates three new bands linked to either a BIC or a guided-mode resonance (GMR) due to the shrinkage of the first Brillouin zone (FBZ). The interaction among these BZF-driven bands can be controlled by tuning the twist angle. At a critical angle, the degeneracy of the

Identifiers

PMID42845940

DOI10.1002/nap2.70164

PMCPMC13642103

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